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|
| Type |
Poster Presentation |
| Area |
Physical Chemistry |
| Room No. |
Event Hall |
| Time |
4월 20일 (금요일) 11:00~12:30 |
| Code |
PHYS.P-149 |
| Subject |
Novel Surface Modification Strategies for Preparing Highly Luminescent Au22 Nanoclusters |
| Authors |
Kyunglim Pyo, SangMyeong Han1, Dongil Lee*
Department of Chemistry, Yonsei University, Korea
1department of chemistry, Yonsei University, Korea
|
| Abstract |
Owing to the geometrically growing interest in biological and optical sensing materials, preparing highly luminescent quantum-sized gold nanoclusters(AuNCs) have been one of the briskly studied field for the past few decades.However, the uncertainty about the origin of the luminescence properties and the low quantum yield(QY<10%) are the largest hurdles for the development of highly luminescent clusters.In this presentation, we present novel strategies for preparing ultrabright luminescent AuNCs by dramatically enhancing the luminescence based on glutathione(SG) protected Au22SG18 (Au22, QY~7%) via relevant surface modification.Firstly, Au22 was ion-paired with bulky tetraoctylammonium(TOA) cation, which rigidified the Au(I)-shell structure by significant intermolecule interactions between the alkyl chains of TOA cations.This cluster was confirmed to maintain its composition, while the quantum yield showed a mass increment of 9-fold enhanced luminescence(QY~60%).This is one of the highest reported yet for AuNCs which is applicable in optical applications such as in light emitting diodes and luminescent sensors.However, TOA-Au22 are not soluble in water which limits their wide use in biological applications.Therefore secondly, we functionalized benzyl chloroformate and pyrene(Py) with Au22 to achieve higher QY in water.This strategy not only enhanced the luminescence by more than 5-fold(QY~30%), owing to the rigidifying effect of the aromatic molecules, but also induced resonance energy transfer from Py to Au22 when photoexcited at 350nm. As a result the luminescence increased by 8-fold compared to Au22.These strategies are expected to open up a new way to prepare ultrabright luminescent non-toxic AuNCs for optical and biological applications. |
| E-mail |
mylifetohoi@naver.com |
|
121st General Meeting of the KCS